import * as Three from 'three';
import * as CONST from '../consts';
import { AABB } from '../physics/common';
import Quadtree from '../physics/quadtree.class';
import { FreeList, clamp } from '../common';

const _mat = new Three.Matrix4();

export default class Asset
{
    selected: boolean = false;

    #layer: number;
    #aabb: AABB;

    #posX: number;
    #posY: number;
    #rot: number;
    #scaleX: number;
    #scaleY: number;

    #sin: number;
    #cos: number;

    #index: number;
    #quad?: number;

    static instance: Three.InstancedMesh = new Three.InstancedMesh(CONST.QUAD, new Three.MeshBasicMaterial({ color: new Three.Color(0xffffff), side: Three.DoubleSide }), 1000000);
    static quadtree: Quadtree = new Quadtree({ x1: -CONST.RESOLUTION_X / 2, x2: CONST.RESOLUTION_X / 2, y1: -CONST.RESOLUTION_Y / 2, y2: CONST.RESOLUTION_Y / 2 }, 6, 10);
    static assets: FreeList<Asset> = new FreeList<Asset>();
    
    constructor(posX?: number, posY?: number, scaleX?: number, scaleY?: number, rotation?: number, layer?: number)
    {
        this.#posX = posX ?? 0, this.#posY = posY ?? 0, this.#scaleX = scaleX ?? 0, this.#scaleY = scaleY ?? 0;
        this.#rot = rotation ?? 0, this.#cos = Math.cos(this.#rot), this.#sin = Math.sin(this.#rot);
        this.#layer = layer ?? 0;

        this.#index = Asset.assets.insert(this);

        console.log(this);
        
        Asset.instance.instanceMatrix.setComponent(this.#index, 0, this.#cos * this.#scaleX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 1, this.#sin * this.#scaleX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 4, -this.#sin * this.#scaleY);
        Asset.instance.instanceMatrix.setComponent(this.#index, 5, this.#cos * this.#scaleY);
        Asset.instance.instanceMatrix.setComponent(this.#index, 12, this.#posX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 13, this.#posY);
        Asset.instance.instanceMatrix.addUpdateRange(this.#index * 16, 16);
        Asset.instance.instanceMatrix.needsUpdate = true;

        this.#aabb = {
            x1: -(this.#scaleX * Math.abs(this.#cos) + this.#scaleY * Math.abs(this.#sin)) / 2 + this.#posX,
            x2: (this.#scaleX * Math.abs(this.#cos) + this.#scaleY * Math.abs(this.#sin)) / 2 + this.#posX,
            y1: -(this.#scaleX * Math.abs(this.#sin) + this.#scaleY * Math.abs(this.#cos)) / 2 + this.#posY,
            y2: (this.#scaleX * Math.abs(this.#sin) + this.#scaleY * Math.abs(this.#cos)) / 2 + this.#posY,
        }
    }
    get aabb(): AABB {
        return this.#aabb;
    }
    get layer(): number {
        return this.#layer;
    }
    get posX(): number {
        return this.#posX;
    }
    get posY(): number {
        return this.#posY;
    }
    get rot(): number {
        return this.#rot;
    }
    get scaleX(): number {
        return this.#scaleX;
    }
    get scaleY(): number {
        return this.#scaleY;
    }
    insert(): Asset
    {
        this.#quad = Asset.quadtree.insert(this.#index, this.#aabb);

        return this;
    }
    remove(): Asset
    {
        this.#quad !== undefined && Asset.quadtree.remove(this.#quad);
        Asset.assets.erase(this.#index);
        Asset.instance.setMatrixAt(this.#index, _mat);
        Asset.instance.instanceMatrix.addUpdateRange(this.#index * 16, 16);
        Asset.instance.instanceMatrix.needsUpdate = true;

        return this;
    }
    update(updateQuad: boolean = true): Asset
    {
        Asset.instance.instanceMatrix.needsUpdate = true;

        if(updateQuad)
        {
            this.#quad !== undefined && Asset.quadtree.remove(this.#quad);
            this.#quad = Asset.quadtree.insert(this.#index, this.#aabb);
        }

        return this;
    }
    moveTo(x: number, y: number): Asset
    {
        this.#aabb.x1 -= this.#posX - x; 
        this.#aabb.x2 -= this.#posX - x; 
        this.#aabb.y1 -= this.#posY - y; 
        this.#aabb.y2 -= this.#posY - y; 

        this.#posX = x, this.#posY = y;
        
        Asset.instance.instanceMatrix.setComponent(this.#index, 12, x);
        Asset.instance.instanceMatrix.setComponent(this.#index, 13, y);

        return this;
    }
    rotateTo(rad: number): Asset
    {
        this.#rot = (rad + Math.PI) % (2*Math.PI) - Math.PI, this.#cos = Math.cos(this.#rot), this.#sin = Math.sin(this.#rot);

        Asset.instance.instanceMatrix.setComponent(this.#index, 0, this.#cos * this.#scaleX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 1, this.#sin * this.#scaleX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 4, -this.#sin * this.#scaleY);
        Asset.instance.instanceMatrix.setComponent(this.#index, 5, this.#cos * this.#scaleY);

        this.#aabb.x1 = -(this.#scaleX * Math.abs(this.#cos) + this.#scaleY * Math.abs(this.#sin)) / 2 + this.#posX;
        this.#aabb.x2 = (this.#scaleX * Math.abs(this.#cos) + this.#scaleY * Math.abs(this.#sin)) / 2 + this.#posX;
        this.#aabb.y1 = -(this.#scaleX * Math.abs(this.#sin) + this.#scaleY * Math.abs(this.#cos)) / 2 + this.#posY;
        this.#aabb.y2 = (this.#scaleX * Math.abs(this.#sin) + this.#scaleY * Math.abs(this.#cos)) / 2 + this.#posY;

        return this;
    }
    matchAABB(aabb: AABB): Asset
    {
        const oldAABB = this.#aabb;

        this.#aabb = aabb;

        this.#posX = this.#aabb.x1 + (this.#aabb.x2 - this.#aabb.x1) / 2, this.#posY = this.#aabb.y1 + (this.#aabb.y2 - this.#aabb.y1) / 2;
        this.#scaleX *= (this.#aabb.x2 - this.#aabb.x1) / (oldAABB.x2 - oldAABB.x1), this.#scaleY *= (this.#aabb.y2 - this.#aabb.y1) / (oldAABB.y2 - oldAABB.y1);

        console.log(this.#posX, this.#posY, this.#scaleX, this.#scaleY);

        Asset.instance.instanceMatrix.setComponent(this.#index, 0, this.#cos * this.#scaleX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 1, this.#sin * this.#scaleX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 4, -this.#sin * this.#scaleY);
        Asset.instance.instanceMatrix.setComponent(this.#index, 5, this.#cos * this.#scaleY);
        Asset.instance.instanceMatrix.setComponent(this.#index, 12, this.#posX);
        Asset.instance.instanceMatrix.setComponent(this.#index, 13, this.#posY);

        return this;
    }
}